My Inquiry
My Account
Analog Devices Inc./Maxim Integrated DS89C450-MNG
- Part No.:
- DS89C450-MNG
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Microcontrollers
- Package:
- 40-DIP (0.600", 15.24mm)
- Datasheet:
-
DS89C450-MNG.pdf
- Description:
- IC MCU 8BIT 64KB FLASH 40DIP
- Quantity:
- Payment:
- Shipping:
Inventory:4,033
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
DS89C450-MNG from Maxim Integrated is a 64kB flash, 33MHz ultra-high-speed 8051-compatible microcontroller with dual data pointers, two full-duplex UARTs, and programmable power management. It executes instructions in one clock cycle (vs. 12 in legacy 8051), delivers 33 MIPS at 33MHz, and supports in-system programming via serial port. It targets industrial control, HVAC, and uninterruptible power supplies where deterministic timing and legacy code compatibility are critical.
For engineers reviewing the DS89C450-MNG datasheet, DS89C450-MNG pinout, DS89C450-MNG application, or DS89C450-MNG equivalent, this page provides verified technical context, validated pin functions, confirmed memory architecture, real-world power modes, and documented alternative parts for drop-in or functional replacement scenarios.
Technical Context
The DS89C450-MNG implements a fully static, one-clock-per-machine-cycle 8051 core with DC–33MHz operation and single-cycle instruction execution at 30ns. Its ROMSIZE feature dynamically selects internal program memory size (0–64kB) and enables full external memory map access without hardware changes.
It integrates dual data pointers with automatic increment/decrement and toggle select, variable-length MOVX timing (2–9 machine cycles), and five-level interrupt priority supporting 13 interrupt sources-including six external interrupts with edge-selectable triggers on Port 1.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Core Architecture | One-clock-per-cycle 8051-compatible CPU; eliminates wasted cycles of legacy 8051, enabling true 33 MIPS at 33MHz |
| Flash Memory | 64kB on-chip flash; supports in-application programming (IAP) and in-system programming (ISP) via UART |
| RAM | 1kB SRAM accessible via MOVX; complements 256B scratchpad RAM for high-throughput data buffering |
| Max Clock Frequency | 33MHz system clock; supports external crystal (1–33MHz) or external clock source with programmable divider/multiplier |
| Power Modes | Active (75–110mA), Idle (40–50mA), Stop (1–100µA bandgap disabled); includes automatic hardware/software exit |
| Operating Voltage | 4.5V to 5.5V; reset trip point at 4.125V (typ), power-fail warning at 4.375V (typ) |
| Temperature Range | -40°C to +85°C ambient; qualified for industrial embedded environments with no derating |
Pinout & Package
DS89C450-MNG uses a 40-pin PDIP package (0.6-inch width) with through-hole mounting. Pin assignments follow standard 8051 layout with enhanced peripheral mapping on Ports 1 and 3.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC (Pin 40) | Supply voltage input | +5V main power rail; decoupling required per industrial EMI standards |
| GND (Pin 20) | Logic ground reference | Common return path for all digital and analog circuitry; separate analog/digital grounding not required |
| RST (Pin 9) | Reset input/output | Bidirectional Schmitt-triggered pin with internal 50–200kΩ pulldown; enables wire-OR reset networks without external RC |
| XTAL1 (Pin 19), XTAL2 (Pin 18) | Clock oscillator interface | Supports fundamental-mode AT-cut crystals (1–33MHz) or external CMOS clock; XTAL1 accepts buffered clock input |
| P0.0–P0.7 (Pins 39–32) | Multiplexed address/data bus | Open-drain I/O with weak pullups; latched by ALE for external memory access; requires external pullups when used as GPIO |
| P1.0–P1.7 (Pins 1–8) | General-purpose I/O with alternate functions | Supports Timer2 I/O (P1.0/P1.1), UART1 (P1.2/P1.3), and five edge-triggered external interrupts (P1.4–P1.7) |
| P2.0–P2.7 (Pins 21–28) | High-order address bus / I/O | Provides A8–A15 during external memory access; retains I/O functionality in non-memory configurations |
| P3.0–P3.7 (Pins 10–17) | Multiplexed I/O with system functions | Includes UART0 (P3.0/P3.1), INT0/INT1 (P3.2/P3.3), T0/T1 (P3.4/P3.5), WR (P3.6), RD (P3.7) |
| EA (Pin 31) | External access control | Low = execute from external program memory; high = execute from internal 64kB flash; enables seamless boot mode selection |
| ALE/PROG (Pin 30) | Address latch enable / programming mode | Drives external latch during memory access; toggles at 1/4 crystal frequency in default mode; doubles as parallel programming entry pin |
Key Features
| Feature | Design Value |
|---|---|
| Dual Data Pointers (DPTR/DPTR1) | Enables zero-overhead block memory moves between internal RAM and external peripherals; automatic increment/decrement reduces loop overhead by >40% |
| Variable-Length MOVX Timing | Configurable 2–9 machine-cycle delays via MD2:MD0 bits; allows direct interfacing with slow SRAM, EEPROM, or legacy peripherals without glue logic |
| Five-Level Interrupt Priority | Supports nested interrupt handling with hardware arbitration; enables real-time response to critical events (e.g., power-fail interrupt) while servicing lower-priority tasks |
| EMI Reduction Mode | Disables ALE during idle periods; reduces radiated emissions by up to 15dB in building automation and industrial control systems |
| ROMSIZE Configuration | Software-selectable internal memory size (0–64kB); permits dynamic partitioning of flash for bootloader/application/code updates without reprogramming |
| Power-Fail Detection | Integrated comparator with 4.375V (typ) warning threshold and 4.125V (typ) reset threshold; eliminates need for external supervisor IC in UPS and energy metering designs |
Applications
| Industrial Control and Automation | HVAC System Controllers |
|---|---|
Use Scenario: Real-time monitoring and actuator control in PLC-based manufacturing lines with multi-sensor inputs and relay outputs. IC Role / Device Role / Timing Role: Primary controller executing deterministic ladder logic with sub-100µs I/O scan cycles using dual DPTRs and fast MOVX. Use Value: 33 MIPS throughput ensures <50ms total cycle time across 16 analog inputs, 8 digital outputs, and Modbus RTU communication-meeting IEC 61131-3 requirements. |
Use Scenario: Embedded thermostat and chiller control unit managing temperature setpoints, fan speed, and refrigerant pressure feedback. IC Role / Device Role / Timing Role: Central MCU coordinating dual UARTs (one for user interface, one for BACnet MS/TP), PWM fan control, and brownout-safe operation. Use Value: Power-fail warning and reset thresholds align with UL 60730 Class B safety requirements, eliminating external voltage monitors. |
| Uninterruptible Power Supplies (UPS) | Building Energy Management Systems |
Use Scenario: Battery-backed AC/DC converter control with real-time voltage/current sampling, battery SOC estimation, and transfer switching. IC Role / Device Role / Timing Role: High-speed ADC interface controller with early-warning power-fail interrupt triggering switchover within 2ms. Use Value: 30ns single-cycle instructions enable precise 10kHz PWM generation and synchronous sampling-critical for THD <3% compliance. |
Use Scenario: Distributed lighting and HVAC node aggregating occupancy, ambient light, and CO₂ sensor data for centralized optimization. IC Role / Device Role / Timing Role: Low-power network node using Stop mode (1µA) between 10s sensor reads and UART-based DALI/KNX gateway bridging. Use Value: Programmable clock divider reduces active current to 40mA at 33MHz, extending battery life in wireless sensor nodes beyond 5 years. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 8051-compatible microcontroller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| DS89C430-MNL | 16kB flash (vs. 64kB), identical pinout, same speed/performance, same peripherals | Suitable for cost-sensitive designs with smaller firmware footprints; no change to PCB or software except flash size configuration | Select when application firmware fits in 16kB and BOM cost reduction is prioritized over future scalability |
| DS87C520-QCL+ | 32kB flash, 33MHz max, lacks dual DPTRs, no ROMSIZE feature, no EMI reduction mode | Legacy upgrade path with reduced peripheral flexibility; requires code adaptation for MOVX timing and interrupt nesting | Choose only for drop-in replacement in existing DS87C520 designs where new features are unused |
Compared with DS89C430-MNL, DS89C450-MNG provides 4× more flash for complex protocols and field-upgradable firmware; compared with DS87C520-QCL+, it adds dual DPTRs, ROMSIZE, and EMI reduction-enabling faster development and certification in industrial environments.
Availability
DS89C450-MNG is available at Aetrix Electronics and suitable for industrial control and automation, HVAC system controllers, and uninterruptible power supplies requiring stable component supply and long-term lifecycle support.
Supply support for DS89C450-MNG includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Maxim Integrated (now part of Analog Devices) designs precision analog, mixed-signal, and high-reliability microcontrollers for industrial, automotive, and communications markets.
The DS89C450-MNG belongs to Maxim's Ultra-High-Speed Flash Microcontroller family, engineered to deliver 8051 software compatibility with 12× faster execution-targeting legacy system upgrades in safety-critical and EMI-sensitive applications.
FAQ
What is the maximum operating frequency of the DS89C450-MNG?
The DS89C450-MNG operates at up to 33MHz system clock frequency, achieving 33 million instructions per second (MIPS) performance. This is enabled by its one-clock-per-machine-cycle architecture, which executes instructions in 30ns at maximum speed-12 times faster than a standard 8051 running at the same crystal frequency. The DS89C450-MNG supports external crystal (1–33MHz) or external clock inputs with programmable dividers.
Does the DS89C450-MNG support in-system programming (ISP)?
Yes, the DS89C450-MNG supports in-system programming via its UART0 interface using ROM-resident or user-defined loader software. It does not require external high-voltage programming signals. The 64kB flash memory can be reprogrammed while the device remains soldered on the target board, enabling field firmware updates and reducing manufacturing test complexity. The DS89C450-MNG also supports parallel programming for high-volume production.
How does the DS89C450-MNG handle power-fail conditions?
The DS89C450-MNG integrates a dedicated power-fail detection circuit with two thresholds: a 4.375V (typ) early-warning interrupt and a 4.125V (typ) reset trip point. This eliminates the need for external supervisor ICs in applications like UPS and energy meters. When VCC drops below VPFW, the DS89C450-MNG asserts an interrupt to trigger controlled shutdown or data save routines before reset occurs-ensuring data integrity during brownout events.
Is the DS89C450-MNG pin-compatible with standard 8051 microcontrollers?
Yes, the DS89C450-MNG is pin-compatible with standard 8051 devices in the 40-pin PDIP package (MNG suffix). It maintains identical pin assignments for VCC, GND, RST, XTAL1/XTAL2, P0–P3, EA, ALE, PSEN, RD, and WR. Software written for legacy 8051 parts runs without modification-except for timing-critical routines-due to its 12× faster instruction execution. No PCB changes are required for socket replacement.
What are the key differences between DS89C450-MNG and DS89C430-MNL?
The DS89C450-MNG and DS89C430-MNL share identical speed (33MHz), peripherals (dual UARTs, dual DPTRs, five-level interrupts), and package (40-pin PDIP), but differ in flash capacity: DS89C450-MNG has 64kB versus 16kB in DS89C430-MNL. Both support in-system programming and ROMSIZE configuration. The DS89C450-MNG is preferred for applications requiring larger firmware images, bootloader separation, or future feature expansion without hardware revision.
DS89C450-MNG Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package/Case:
- 40-DIP (0.600", 15.24mm)
- Series:
- 89C
- Packaging:
- Tube
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Core Processor:
- 8051
- Core Size:
- 8-Bit
- Speed:
- 25MHz
- Connectivity:
- EBI/EMI, SIO, UART/USART
- Peripherals:
- Power-Fail Reset, WDT
- Number of I/O:
- 32
- Program Memory Size:
- 64KB (64K x 8)
- Program Memory Type:
- FLASH
- EEPROM Size:
- -
- RAM Size:
- 1K x 8
- Voltage - Supply (Vcc/Vdd):
- 4.5V ~ 5.5V
- Data Converters:
- -
- Oscillator Type:
- External
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
DS89C450-MNG FAQ
1.How can I place an order for DS89C450-MNG through Aetrix?
Please submit a Request for Quotation (RFQ) for DS89C450-MNG on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for DS89C450-MNG reliable?
The price and inventory of DS89C450-MNG are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DS89C450-MNG is usually 5 days.
3.What payment methods are accepted for DS89C450-MNG?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DS89C450-MNG transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DS89C450-MNG?
DS89C450-MNG orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DS89C450-MNG order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for DS89C450-MNG?
For technical support, including DS89C450-MNG datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DS89C450-MNG requirements.
6.How does Aetrix verify that DS89C450-MNG is sourced from the original manufacturer or authorized distributors?
All DS89C450-MNG products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that DS89C450-MNG meets industry standards.
7.What is the process for return or replacement of DS89C450-MNG?
All DS89C450-MNG units undergo pre-shipment inspection (PSI). If there is an issue with DS89C450-MNG, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The DS89C450-MNG part is unused and in its original packaging.
Return procedure for DS89C450-MNG:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
DS89C450-MNG Tags
-
ATTINY4-TSHR
Microchip Technology
-
ATTINY10-TSHR
Microchip Technology
-
ATTINY10-TS8R
Microchip Technology
-
ATTINY202-SSNR
Microchip Technology
-
ATTINY202-SSFR
Microchip Technology
-
ATTINY402-SSNR
Microchip Technology
-
PIC16F15213T-I/MF
Microchip Technology
-
PIC16F15213-E/MF
Microchip Technology
-
PIC10F200T-I/OT
Microchip Technology
-
ATTINY412-SSNR
Microchip Technology
-
PIC10F202T-I/OT
Microchip Technology
-
ATTINY404-SSNR
Microchip Technology
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
